Directly imaging spin polarons in a kinetically frustrated Hubbard system

Prichard, Max L.; Spar, Benjamin M.; Morera, Ivan; Demler, Eugene; Yan, Zoe Z.; Bakr, Waseem S.

doi:10.1038/s41586-024-07356-6

Nature

2024

DOI: 10.1038/s41586-024-07356-6

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Directly imaging spin polarons in a kinetically frustrated Hubbard system

Max L. Prichard,

Benjamin M. Spar,

Ivan Morera

et al.

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2024

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Cited by 5 publications

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Single-hole spectra of Kitaev spin liquids: from dynamical Nagaoka ferromagnetism to spin-hole fractionalization

Kadow,

Jin,

Knolle

et al. 2024

npj Quantum Mater.

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The dynamical response of a quantum spin liquid upon injecting a hole is a pertinent open question. In experiments, the hole spectral function, measured momentum-resolved in angle-resolved photoemission spectroscopy (ARPES) or locally in scanning tunneling microscopy (STM), can be used to identify spin liquid materials. In this study, we employ tensor network methods to simulate the time evolution of a single hole doped into the Kitaev spin-liquid ground state. Focusing on the gapped spin liquid phase, we reveal two fundamentally different scenarios. For ferromagnetic spin couplings, the spin liquid is highly susceptible to hole doping: a Nagaoka ferromagnet forms dynamically around the doped hole, even at weak coupling. By contrast, in the case of antiferromagnetic spin couplings, the hole spectrum demonstrates an intricate interplay between charge, spin, and flux degrees of freedom, best described by a parton mean-field ansatz of fractionalized holons and spinons. Moreover, we find a good agreement of our numerical results to the analytically solvable case of slow holes. Our results demonstrate that dynamical hole spectral functions provide rich information on the structure of fractionalized quantum spin liquids.

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Single-hole spectra of Kitaev spin liquids: from dynamical Nagaoka ferromagnetism to spin-hole fractionalization

Kadow,

Jin,

Knolle

et al. 2024

npj Quantum Mater.

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Observation of Nagaoka polarons in a Fermi–Hubbard quantum simulator

Lebrat,

Xu,

Kendrick

et al. 2024

Nature

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Polaronic mechanism of Nagaoka ferromagnetism in Hubbard models

Samajdar,

Bhatt

2024

Phys. Rev. B

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Directly imaging spin polarons in a kinetically frustrated Hubbard system

Cited by 5 publications

References 53 publications

Single-hole spectra of Kitaev spin liquids: from dynamical Nagaoka ferromagnetism to spin-hole fractionalization

Single-hole spectra of Kitaev spin liquids: from dynamical Nagaoka ferromagnetism to spin-hole fractionalization

Observation of Nagaoka polarons in a Fermi–Hubbard quantum simulator

Polaronic mechanism of Nagaoka ferromagnetism in Hubbard models

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